Three phase supply - need a three phase heat pump and battery system?

[lookseehear]

We're moving our electricity supply and National Grid said they only put in three phase in this situation. I initially was quite pleased about this - it felt future proof.

 

I'm now looking at solar and battery combinations, and installers seem less experienced with three phase systems and the cost seems higher. There's the benefit of being guaranteed ~12kW export balanced across the three phases. We're also planning to put in an ASHP and I assume that we would now need to put in a three phase ASHP to spread the load over the phases, and again there looks like there's less choice and potentially more cost involved.

 

It feels like going three phase has added cost and complexity at this point. Is it possible to run it all off one phase or push National Grid to put single phase in? It feels like an own goal with three phase to not have the heat pump and battery on the same phase, but then the system will be out of balance.

 

Am I missing something or does it all have to be three phase to play nicely together.